package com.zhaoye.controller;

import com.alibaba.csp.sentinel.annotation.SentinelResource;
import com.alibaba.csp.sentinel.slots.block.BlockException;
import com.zhaoye.entities.CommonResult;
import com.zhaoye.entities.Payment;
import com.zhaoye.service.PaymentService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;

import javax.annotation.Resource;

/**
 * @author feng
 * @Date 2021/11/21 16:04
 *   block 和fallback同时配置，若block被降级限流，抛出block异常
 */
@RestController
@Slf4j
public class CircleBreakerController {

    public static final String SERVICE_URL = "http://nacos-payment-provider";

    @Resource
    private RestTemplate restTemplate;

    @Resource
    private PaymentService paymentService;

    @RequestMapping("/consumer/fallback/{id}")
    @SentinelResource(value = "fallback",fallback = "handlerFallback",blockHandler = "blockHandler")//没有配置
    public CommonResult<Payment> fallback(@PathVariable Long id)
    {
        CommonResult<Payment> result = restTemplate.getForObject(SERVICE_URL + "/paymentSQL/"+id, CommonResult.class,id);

        if (id == 4) {
            throw new IllegalArgumentException ("IllegalArgumentException,非法参数异常....");
        }else if (result.getData() == null) {
            throw new NullPointerException ("NullPointerException,该ID没有对应记录,空指针异常");
        }

        return result;
    }

    public CommonResult handlerFallback(@PathVariable("id")Long id,Throwable e){
          Payment payment = new Payment(id,"null");
          return new CommonResult(444,"兜底异常handlerFallback，exception:" + e.getMessage(),payment);
    }

    public CommonResult blockHandler(@PathVariable("id")Long id, BlockException blockException){
        Payment payment = new Payment(id,"null");
        return new CommonResult(445,"blockHanler限流,无此流水，异常信息:"+blockException);
    }


    //openFeign组件调用
    @GetMapping(value = "/consumer/paymentSQL/{id}")
    public CommonResult<Payment> paymentSQL(@PathVariable("id")Long id){
        return paymentService.paymentSQL(id);
    }
}